What has always mystified me about the phrase 'natural flavors' is that a person could be deathly allergic to the flavoring, or part of it, and it is not listed on the ingredients.

The following is a little exerpt about that topic. It is all very interesting.

"The federal Food and Drug Administration does not require companies to disclose the ingredients of their color or flavor additives so long as all the chemicals in them are considered by the agency to be GRAS ("generally recognized as safe"). This enables companies to maintain the secrecy of their formulas. It also hides the fact that flavor compounds often contain more ingredients than the foods to which they give taste. The phrase "artificial strawberry flavor" gives little hint of the chemical wizardry and manufacturing skill that can make a highly processed food taste like strawberries. "